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Mechanical Engineering Interview Questions

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How many types of gear boxes are there?

Asked By: aidan_suzlon | Asked On: Jul 16th, 2008

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Answered by: bala

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Member Since Nov-2005 | Answered On : Aug 2nd, 2008

Thare are 4 types of gear box.
1. sliding mesh gear box.
2.constant mesh gear box.
3.synchromesh gear box.
4.planetarty gear box.

Answered by: dhavalsinh parmar on: Jul 23rd, 2014

There are mainly 4 types of gear box are:

1.sliding mesh gearbox.

2.constant mesh gearbox.
3.synchromesh gear box.
4.epyclic gearbox.

and other gear box are classified according to its function and shape.but mainly are above .

Answered by: rk reddy on: Jul 22nd, 2014

1.helical gear box
2.bevel gear box
3.planetary gear box
4.worm gear box
5.spiral bevel gear box

Pressure v/s stress

Asked By: vrsaikumar | Asked On: Jun 25th, 2009

Though units for pressure and stress are same (i.E n/mm2)what is the difference between stress and pressure?

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Answered by: abhishank

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Member Since Jun-2009 | Answered On : Jun 28th, 2009

Stress is restoring force developed in the body due to any tensile, compressive or any other force per unit area and on the other hand pressure is force applied on a body per unit area.

Answered by: kamlesh431 on: Jul 24th, 2014

When we applied load per unit area that is pressure And internal resistance (i.e. reaction due to applied force) per unit area is Stress.

It means pressure is due to externally applied force and stress is due to internal reaction(that will be a force) due to that applied force.

Answered by: farshid on: Oct 11th, 2013

Stress is scaler .not vector

Petrol engine

Asked By: Basky | Asked On: Jul 3rd, 2009

What happen if we pour petrol in diesel engine and vice versa? Explain

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Answered by: richa tiwari

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Member Since Aug-2009 | Answered On : Aug 30th, 2009

When petrol is used in diesel engine, the engine will not work as gasoline (petrol) has high ignition temperature and therefore has to be ignited by spark-ignition. Diesel engine on the other hand works on the principal of self-ignition in compressed fuel which is not possible with petrol.

When diesel is used in petrol engine, there will be sudden combustion in the fuel due to spark ignition  bcoz diesel has low ignition temperature. This will lead to high knocking, which is absolutely undesirable.

Answered by: kamlesh431 on: Jul 24th, 2014

The compression ratio of petrol engine is 10:1 to 14:1 and for diesel engine is 16:1 to 22:1. If petrol is poured in diesel engine a blast may happen at this high compression ratio. So we cant use pe...

Answered by: richa tiwari on: Aug 30th, 2009

When petrol is used in diesel engine, the engine will not work as gasoline (petrol) has high ignition temperature and therefore has to be ignited by spark-ignition. Diesel engine on the other hand wo...

Meaning of numerology on spanners and wrenches

Asked By: kamlesh431 | Asked On: Jul 18th, 2014

When I see any spanner then always there is a number on its ends, like 10,11,12... what is the exact meaning of that numbers?

Answered by: DHAVALSINH PARMAR on: Jul 23rd, 2014

This number is used because it is show that, which size of bolt or nut is opened by this spanner or in other words the number is show that only this size of nut or bolt is tight and open by it.

Bending moment diagram for a udl

Asked By: yogi333 | Asked On: Dec 10th, 2007

Bending moment diagram for a udl in cantilever beam.A. Parabolab. Trianglec. Rectangle

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Answered by: ramanan33

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Member Since Jun-2008 | Answered On : Jun 8th, 2008


Answered by: Saurabh Sanjay Dube on: Jul 14th, 2014


Answered by: rajasekhar on: Jul 2nd, 2014


Lathe and milling machines

Asked By: sanjaymanral | Asked On: Aug 14th, 2010

What is the difference between lathe & milling machine? What are the operations that we cannot perform in lathe but milling?

Answered by: ADIRAJ C K on: Jul 12th, 2014


Answered by: sagar on: Mar 3rd, 2014

Making of drill bits and gear cutting operations are done in milling machine by indexing attachment.

it is not possible in lathe.

What is npsh?

Asked By: Mahmoud Hussien | Asked On: Jul 6th, 2014

Answered by: sushil on: Jul 14th, 2014


What is the difference between process audit & product audit ?

Asked By: karanjkar | Asked On: Oct 28th, 2013

Answered by: ADIRAJ C K on: Jul 12th, 2014

In process audit- The parameters of the machine (speed,feed,rpm etc) are taken into consideration but in Product audit- The parameters of the job (dimension,strength,surface finish etc...) is taken into consideration.

Answered by: Siddhartha Sharma on: Feb 25th, 2014

Process Audit :-Auditor will concentrate on process at each stage & itss relevant parameters process parameters like temperature, pressure, speed etc.Along with this he audits operator competency leve...

Si and ci engine

Asked By: swadhin sahoo | Asked On: Aug 2nd, 2010

Why we use petrol in si engine & diesel in ci engine

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Answered by: hosam_ozo

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Member Since Apr-2010 | Answered On : Aug 8th, 2010

First thing you have to know is what is called cetane and octane number.

The octane number is the percentage of octane in the mixture of fuel
The centane number is the percentage of cetane
The octane number expresses the self ignition temperature, as this no. increases the self ignition temperature increases too and this make the knock to be avoidable and the cetane no. is vice verse

**Octane no. increase self ignition increase and cetane no decrease"" SIE needs high octane no"
**Cetane no increase the octane no decrease and the self ignition temperature decrease" CIE needs this"

Case 1: SI engine we dont want the Self Ignition to be reached we use a fuel have a high octane to avoid the knock "which damage the engine"

Case 2: CI the compression ratio is too high "12:22" and this kind of engine depends essentially on the self ignition temperature so we use a fuel with high cetane no "low octane" as the high cetane "low octane" gives low self ignition temperature and that is we need in the CIE..

Answered by: ABHIJAY on: Jul 10th, 2014

Si engines means spark ignition engines. With the help of spark plug, spark is produced in engine cylinder. Before this process occurs, mixture of air and fuel entered in engine cylinder during s...

Answered by: PRAVIN KAD on: Aug 9th, 2011

Si engines means spark ignition engines. With the help of spark plug, spark is produced in engine cylinder. Before this process occurs, mixture of air and fuel entered in engine cylinder during suctio...

What is the difference between sress and strain ?

Asked By: thippareddyarun | Asked On: Apr 25th, 2011

Answered by: dileepkumar on: Jul 6th, 2014

Change in length / original length

Answered by: Sunil on: Jul 3rd, 2014

Stress is the resistance develop in a body against the deforming load.
While the strain is relative measure of deformation produced in a body due to deforming load.

What is meant by carburetor

Asked By: Dinesh Choudhary | Asked On: Sep 27th, 2013

Answered by: kathiravan on: Jul 5th, 2014

a carburetor is a device to mix the air-fuel and allows to the cylinder.not only it is used to mix the air-fuel,it also give correct ratio of air-fuel mixture to the cylinder. the ratios are 1). lean...

Answered by: ajaj on: Jun 26th, 2014

A carburetion is the process of to make petrol in atomisation, for mixed with clean air. This process is done by the carburetor.

Effect of combustion of diesel in petrol engine?

Asked By: Bhushan Kulkarni | Asked On: Oct 30th, 2013

What will happen if diesel is used instead of petrol in si engine?

Answered by: kathiravan on: Jul 5th, 2014

first of all petrol in si engine burn only with help of spark plug. whatever the maximum pressure petrol engine only burned with the help of spark plug.but diesel fuel combustion process done only at ...

Answered by: Aneesh on: May 28th, 2014

The engine will stop working and we need to clean the entire fuel system and refill with petrol to make the engine work

Calculating heat transfer through a cylinder

Asked By: sdoustdar | Asked On: Jul 2nd, 2014

How do you calculate the heat transfer thorough a cylinder with lower temperature on the bottom than on the top. The temperature of the ambient is 20 deg c, inside is 77 deg k, the bottom disk is 5 deg c. What would be the temp on the top?

Ic engine

Asked By: mvsrprakash | Asked On: Jan 6th, 2013

What will happen by pouring diesel in petrol engine instead of petrol ?

Answered by: gokul k on: Jun 26th, 2014

The ignition will not happen as diesel requires a large compression ratio. but the petrol engine will not have a sufficient pressure difference to ignite the diesel

Answered by: akhil ramireddi on: Jun 3rd, 2014

IC engine is may be defined as the combustion is done on the in side of the cylinder is called as a internal combustion engine

Fluid mechanics

Asked By: adnan mehmood | Asked On: Oct 30th, 2010

What is diffrence between impeller and propeller?

Answered by: Vivek K on: Jun 17th, 2014

Impeller has blades in which the blade angle can be varied.
propeller has fixed blade angles.

Answered by: احمد امام on: Dec 8th, 2013

An impeller is used to suck air into something, such as a turbocharger or a vacuum cleaner.

A propeller is used for propulsion, such as on an airplane or a boat.

What is dtsi? Why is this used in motor bikes?

Asked By: piyush | Asked On: Sep 12th, 2011

Answered by: Naveen verma on: Jun 8th, 2014

Digital twin spark ignition system increase the efficiency of fule and give better combustion it means fule burn fully  in this system two spark plugs used at a time one is used for starting the engine 2nd one is used for combustion. 

Answered by: vinodh reddy on: Jan 18th, 2014

Dtsi Is digital twin spark ignition it is 1st used by bajaj motors which helps in reducing excess fuel burn nd gives  efficient milage

What is torque ?

Asked By: Naresh jain | Asked On: Mar 15th, 2012

Answered by: gaurav dhote on: Jun 6th, 2014

The twisting or turning force required to turn or twist the object is know as torque.

Answered by: balakumara samy on: Jun 14th, 2012

Torque is the measure of how much acting on the object causes the object to rotate

Carnot engine efficiency

Asked By: Gambit | Asked On: Jul 31st, 2009

What is maximum efficiency of carnot engine?

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Answered by: bhargavmech

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Member Since Jul-2009 | Answered On : Aug 1st, 2009

The maximum efficiency of the carnot engine only depends on two factors:

1 - The temperature of the hot reservoir (TH)
2 - The temperature of the cold reservoir (TC)

And is given by (TH - TC) / TH « or » 1 - TC / TH So by that we can see the maximum efficiency (100%) would be when the difference of temperatures between the two reservoirs is infinite.

Answered by: Rakesh Sharma on: May 24th, 2014

There is not any even a single cycle having efficiency higher than the carnot cycle efficiency it means carnot engine having 100% efficiency.

Answered by: Anupam on: Aug 9th, 2013

There is two isothermal and two adiabatic process, isothermal process is very slow and adiabatic is very fast. it is impossible this cycle

Production and manufacturing

Asked By: khaleelkhanp | Asked On: Nov 17th, 2008

What is the difference between production and manufacturing

Answered by: Rahul kumar sen on: May 20th, 2014

the main difference between manufacturing and production: In manufacturing row material convert into finished shape without predicting operation in future while production need standardization raw mat...

Answered by: vicky on: Sep 11th, 2011

Production is the entire process to manufacture a component.

Manufacturing is the process in which we can able to get a desire shape or size from the raw material.

Tractor wheels

Asked By: anuragdhupiya | Asked On: Feb 16th, 2009

Why is the rear wheel of tractor larger than its front wheel?

Answered by: Srinivas pilla on: May 20th, 2014

You know tractor takes less space in turnings than other vehicles like buses lorries that's why it has large space at the rare it provides best turning and more secure my advice please watch a tractor while it takes turn try. u know

Answered by: akash.2929 on: Aug 7th, 2009

1. Bigger wheel - more radius hence more torque.2. Bigger base - for farming over fields, to reduce pressure.The front wheels are not changed to avoid unnecessary cost. Even in big carrier trucks one ...

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